The answer “correct” is never accepted; it must be “right”. However the dictionary seems to allow correct as a translation. Any thoughts re this being allowed: Maybe Aino is correct. ? I guess I think in terms of right/left and correct/wrong pairs.
oikea(ssa) is the adjective : oikea vastaus = correct answer
oikein is the adverb : Hän vastasi oikein = She answered right
In this sentence "right" is an attribut of the name Aino, so the adjective form is used